Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:49:18 2012 Optimize a model with 834 rows, 184 columns and 1668 nonzeros Presolve removed 187 rows and 1 columns Presolve time: 0.01s Presolved: 647 rows, 183 columns, 1414 nonzeros Variable types: 0 continuous, 183 integer (183 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 7.275000e+01, 342 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72.75000 0 155 54.00000 72.75000 34.7% - 0s 0 0 71.82126 0 180 54.00000 71.82126 33.0% - 0s 0 0 70.76891 0 178 54.00000 70.76891 31.1% - 0s 0 0 69.89688 0 178 54.00000 69.89688 29.4% - 0s 0 0 69.22544 0 181 54.00000 69.22544 28.2% - 0s 0 0 69.02465 0 182 54.00000 69.02465 27.8% - 0s 0 0 68.81836 0 182 54.00000 68.81836 27.4% - 0s 0 0 68.75700 0 182 54.00000 68.75700 27.3% - 0s 0 0 68.67915 0 181 54.00000 68.67915 27.2% - 0s 0 0 68.58881 0 182 54.00000 68.58881 27.0% - 0s 0 0 68.57277 0 182 54.00000 68.57277 27.0% - 0s 0 0 68.57277 0 180 54.00000 68.57277 27.0% - 0s 0 2 68.56540 0 180 54.00000 68.56540 27.0% - 0s H 84 49 55.0000000 68.26151 24.1% 42.7 0s * 144 67 19 56.0000000 67.90341 21.3% 39.4 0s H 164 72 57.0000000 67.48260 18.4% 41.6 0s * 501 228 19 58.0000000 65.94699 13.7% 40.1 1s 613 276 64.30000 7 182 58.00000 65.70820 13.3% 38.6 5s H 1133 383 59.0000000 65.70820 11.4% 43.6 6s 2927 1030 60.00000 39 100 59.00000 63.96875 8.42% 35.3 10s 6991 1603 60.45699 32 141 59.00000 62.29167 5.58% 29.8 15s *11076 216 34 60.0000000 61.00000 1.67% 27.3 18s Cutting planes: Gomory: 4 Zero half: 66 Explored 11304 nodes (306563 simplex iterations) in 18.64 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%